A circuit breaker tripping stroke adjusting tool

Abstract

The utility model discloses a circuit breaker tripping stroke adjusting tool, including the casing, the lower extreme of casing is equipped with the adjusting mouth, be equipped with the locating block in the adjusting mouth along the arc trajectory slide and lock, the locating groove is equipped with on the casing lower end face, is located adjusting mouth both sides along the casing length direction and is equipped with, the width of locating groove is compatible with the baffle thickness of circuit breaker base, one end in the locating groove is equipped with the baffle, the baffle can be with the inner wall of first installation mouth abut, when the groove bottom of locating groove and the upper end face of baffle are attached, and the baffle and first installation mouth inner wall abut, the center of arc trajectory and the rotation axis of traction rod coincide. The utility model can be accurate to the traction rod angle and carry out the quick adjustment, need not repeatedly debug, improve the adjustment efficiency, guarantee the consistency and reliability of tripping stroke.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker manufacturing technology, specifically to a circuit breaker tripping stroke adjustment tooling. Background Technology

[0002] Molded case circuit breakers (MCCBs) are widely used in circuit installations as important components for protecting against overload. They are often found in the base half of the circuit breaker (e.g.,...). Figure 1 As shown in the diagram, during the production process, the base contains injection-molded insulating partitions to separate the phases. These partitions serve not only as a support structure but also as mounting bases for various operating mechanisms. The partitions typically have a first mounting opening for assembling the shaft that drives the contact arm for opening and closing operations. On the partition, located to one side of the first mounting opening, there is also a second mounting opening for mounting the traction rod that adjusts the tripping stroke. This traction rod acts as the adjustment hub of the tripping system, and it has an integrally formed boss. This boss abuts against a pre-set limiting surface within the second mounting opening to act as a mechanical stop, limiting the rotation angle range of the traction rod, preventing over-adjustment, and avoiding damage or malfunction of the mechanism.

[0003] In the existing circuit breaker base half-machine production process, adjusting the angle of the traction rod is a key process that determines the product's tripping stroke. Currently, the adjustment operation mainly relies on operators manually tightening the adjusting bolts (such as...). Figure 2 As shown in the diagram, the bolt is used to hold the limiting plate on the traction rod to limit its elevation angle (i.e., the reference for the tripping stroke). However, this operation method, which relies on manual feel and experience, is prone to deviations in adjustment results between different operators or between different batches by the same operator, making it difficult to guarantee the consistency of the bolt tightening depth. Even when attempting to reduce the difference in tightening depth by tightening it all the way to the bottom (using a bolt of a specific length), the problem persists. This is because the mounting base of the adjusting bolt is a stamped sheet metal part, and there are certain errors in its stamping accuracy and subsequent assembly position. These errors cause the actual position of its lower end (the point of action) to still deviate after the bolt is tightened all the way to the bottom, affecting the consistency and reliability of the tripping stroke, and thus affecting the product's breaking performance. Utility Model Content

[0004] Purpose of the utility model: To provide a circuit breaker tripping stroke adjustment fixture that can quickly and accurately adjust the angle of the traction rod without repeated adjustments, thereby improving adjustment efficiency and ensuring the consistency and reliability of the tripping stroke.

[0005] Technical solution: A circuit breaker tripping stroke adjustment fixture includes a housing, an adjustment port at the lower end of the housing, a positioning block that can slide and lock along an arc-shaped trajectory inside the adjustment port, and a positioning groove extending through the lower end surface of the housing on both sides of the adjustment port along the length of the housing. The width of the positioning groove is adapted to the thickness of the partition plate of the circuit breaker base. A stop block is provided at one end of the positioning groove, and the stop block can abut against the inner wall of the first mounting port. When the bottom of the positioning groove is in contact with the upper end surface of the partition plate and the stop block abuts against the inner wall of the first mounting port, the center of the arc-shaped trajectory coincides with the rotation axis of the traction rod.

[0006] A further improvement of this utility model is that the housing is provided with a locking component for locking the positioning block, the locking component including a plurality of locking parts arranged at intervals along the arc-shaped trajectory.

[0007] A further improvement of this utility model is that the locking part is a screw hole, and the locking assembly further includes a locking bolt that is threadedly engaged with the screw hole, the end of which can abut against the side wall of the positioning block.

[0008] A further improvement of this utility model is that at least three screw holes are provided, and the distance between adjacent screw holes is less than the length of the positioning block along the sliding direction.

[0009] A further improvement of this utility model is that the adjustment port is an arc-shaped port, and an arc-shaped groove is provided inside the arc-shaped port, and the positioning block is slidably connected inside the arc-shaped groove.

[0010] A further improvement of this utility model is that the positioning block is a sector-shaped block, the lower end of which is provided with an arc surface that matches the outer periphery of the traction rod, and one side of the sector-shaped block can abut against the side of the boss of the traction rod.

[0011] A further improvement of this utility model is that the lower edge of the sector block is chamfered.

[0012] A further improvement of this utility model is that the shell is rectangular, and the stop block is integrally formed with the shell. Beneficial effects

[0013] This invention uses the partition plate of the circuit breaker base as a positioning reference. Because the circuit breaker housing is manufactured using injection molding, its dimensional accuracy is high and its error is small, resulting in higher positioning accuracy compared to sheet metal parts. By setting a positioning groove adapted to the thickness of the circuit breaker partition plate and a stop block that can abut against the inner wall of the first mounting port, the fixture can be quickly and accurately positioned on the partition plate. After calibration, the positioning block in the fixture only requires rotating the traction rod until its boss abuts against the positioning block to achieve the desired adjustment angle. In batch operations, this fixed standard angle can be quickly and accurately replicated to each product, improving the accuracy and consistency of adjustment, reducing the labor intensity and skill requirements of operators, and ensuring the reliability of the tripping stroke setting.

[0014] The locking assembly of this invention has multiple locking parts distributed along an arc-shaped trajectory, which allow the positioning block to slide and lock within a certain range. It can be flexibly adjusted, and the positioning block can be firmly fixed by tightening the locking bolts, preventing accidental movement during the adjustment process, ensuring the stability of the adjustment result, and has a low cost, making it suitable for mass production.

[0015] This invention ensures that the positioning block can be effectively locked at any position on the arc trajectory by setting at least three screw holes with an adjacent spacing less than the length of the positioning block, providing continuous and reliable locking capability, further improving the accuracy and reliability of adjustment, and adapting to adjustment needs at different angles. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the base half-machine structure of a circuit breaker in the prior art.

[0017] Figure 2 This is a partially enlarged schematic diagram of the circuit breaker limit plate structure in the prior art.

[0018] Figure 3 This is a partially enlarged schematic diagram of the half-machine structure of the circuit breaker base in the prior art.

[0019] Figure 4 This is a schematic diagram of the installation position of this utility model.

[0020] Figure 5 This is a schematic diagram of the structure of this utility model.

[0021] Figure 6 This is a side view sectional diagram of the structure of this utility model.

[0022] In the figure, 1-shell, 2-adjustment port, 3-positioning block, 4-positioning groove, 5-stop block, 6-screw hole, 7-locking bolt, 8-arc surface, 9-partition plate, 10-first mounting port, 11-rotating shaft, 12-second mounting port, 13-traction rod, 14-bore, 15-limiting plate, 16-adjustment bolt, 17-mounting base of adjustment bolt. Detailed Implementation

[0023] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1: Combination Figures 1-6 It is known that a circuit breaker tripping stroke adjustment fixture includes a housing 1. The lower end of the housing 1 is provided with an adjustment port 2. The adjustment port 2 is provided with a positioning block 3 that can slide and lock along an arc-shaped trajectory. On the lower end surface of the housing 1, on both sides of the adjustment port 2, a positioning groove 4 is provided through the length direction of the housing 1. The width of the positioning groove 4 is adapted to the thickness of the partition of the circuit breaker base. A stop block 5 is provided in one end of the positioning groove 4. The stop block 5 can abut against the inner wall of the first mounting port. When the bottom of the positioning groove 4 is in contact with the upper end surface of the partition and the stop block 5 abuts against the inner wall of the first mounting port, the center of the arc-shaped trajectory coincides with the rotation axis of the traction rod.

[0025] The housing 1 is provided with a locking assembly for locking the positioning block 3. The locking assembly includes multiple locking parts arranged at intervals along an arc-shaped trajectory.

[0026] Preferably, the locking part is a screw hole 6, and the locking assembly also includes a locking bolt 7 that is threaded into the screw hole 6. The end of the locking bolt 7 can abut against the side wall of the positioning block 3. There are at least three screw holes 6, and the distance between adjacent screw holes 6 is less than the length of the positioning block 3 along the sliding direction. This ensures that after the positioning block 3 slides into place at any position on the arc trajectory, at least one screw hole 6 is facing the side wall area of ​​the positioning block 3, and can be effectively locked by the corresponding locking bolt 7.

[0027] The adjustment port 2 is arc-shaped, with an arc-shaped groove inside. The positioning block 3 is slidably connected within the arc-shaped groove. This provides guidance, allowing the positioning block to slide smoothly along the arc-shaped trajectory, preventing it from deviating from the trajectory and ensuring a smooth and accurate adjustment process. The arc-shaped port and the arc-shaped groove facilitate the exposure of the positioning block and its contact with the boss. Preferably, the arc-shaped port and the arc-shaped groove are concentric.

[0028] The cross-section of the arc groove is preferably T-shaped or dovetail-shaped, and the positioning block 3 has a matching sliding part, so that the positioning block 3 can slide along the arc trajectory and will not fall out of the groove.

[0029] Preferably, the positioning block 3 is a sector-shaped block with an arc surface 8 at its lower end that mates with the outer periphery of the traction rod. One side of the sector-shaped block can abut against the side of the boss on the traction rod. This allows it to engage with the traction rod and its boss with the largest possible contact area, improving the positioning effect, enhancing the rigidity and stability during contact, and preventing slippage.

[0030] The lower edge of the sector-shaped block is chamfered. This facilitates the insertion and adjustment of the positioning block, reduces interference with the traction rod, and makes operation smoother. Preferably, the housing 1 is rectangular, and the stop block 5 is integrally formed with the housing 1.

[0031] The working principle of the circuit breaker tripping stroke adjustment fixture provided by this utility model is as follows: During calibration, a circuit breaker base with a tripping stroke conforming to the design standard is selected as the calibration benchmark. The positioning slot 4 of the fixture is inserted into the upper edge of the partition plate of this standard circuit breaker base, ensuring that the bottom of the positioning slot 4 is flush with the surface of the partition plate. Simultaneously, the stop block 5 is embedded in the first mounting opening of the partition plate and tightly abuts against the inner wall of the opening. At this point, the fixture is accurately positioned. Then, the positioning block 3 is slid so that its side abuts against the boss of the standard traction rod. The position of the positioning block 3 at this point represents the standard tripping stroke angle. Finally, a suitable screw hole 6 is selected, and the locking bolt 7 is tightened so that the end of the bolt firmly abuts against the side wall of the positioning block 3, securely locking the positioning block 3 in this standard position, completing the fixture calibration.

[0032] In use, install the calibrated and locked fixture onto the base of the circuit breaker to be adjusted using the same positioning method described above. Then, rotate the pull rod on the circuit breaker until its boss abuts against the locked positioning block 3 on the fixture. This abutment position represents the standard tripping stroke angle calibrated by the standard parts. Assembling or fixing the pull rod at this angle achieves rapid and accurate tripping stroke adjustment, ensuring consistency of the tripping stroke angle in mass production.

[0033] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent transformations or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

[0034] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Any equivalent structural or process transformations made using the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

Claims

1. A circuit breaker tripping stroke adjustment fixture, characterized in that: The device includes a housing (1), with an adjustment port (2) at the lower end of the housing (1). A positioning block (3) that can slide and lock along an arc-shaped trajectory is provided in the adjustment port (2). A positioning groove (4) is provided on the lower end surface of the housing (1) on both sides of the adjustment port (2) along the length of the housing (1). The width of the positioning groove (4) is adapted to the thickness of the partition plate of the circuit breaker base. A stop block (5) is provided at one end of the positioning groove (4). The stop block (5) can abut against the inner wall of the first mounting port. When the bottom of the positioning groove (4) is in contact with the upper end surface of the partition plate and the stop block (5) abuts against the inner wall of the first mounting port, the center of the arc-shaped trajectory coincides with the rotation axis of the traction rod.

2. The circuit breaker tripping stroke adjustment fixture according to claim 1, characterized in that: The housing (1) is provided with a locking assembly for locking the positioning block (3), the locking assembly including a plurality of locking parts arranged at intervals along the arc trajectory.

3. The circuit breaker tripping stroke adjustment fixture according to claim 2, characterized in that: The locking part is a screw hole (6), and the locking assembly also includes a locking bolt (7) that is threaded into the screw hole (6). The end of the locking bolt (7) can abut against the side wall of the positioning block (3).

4. The circuit breaker tripping stroke adjustment fixture according to claim 3, characterized in that: The screw holes (6) are provided at least three, and the distance between adjacent screw holes (6) is less than the length of the positioning block (3) along the sliding direction.

5. A circuit breaker tripping stroke adjustment fixture according to claim 1 or 2, characterized in that: The adjustment port (2) is an arc-shaped port, and an arc-shaped groove is provided inside the arc-shaped port. The positioning block (3) is slidably connected inside the arc-shaped groove.

6. The circuit breaker tripping stroke adjustment fixture according to claim 5, characterized in that: The positioning block (3) is a sector-shaped block with an arc surface (8) at its lower end that matches the outer periphery of the traction rod. One side of the sector-shaped block can abut against the side of the boss of the traction rod.

7. The circuit breaker tripping stroke adjustment fixture according to claim 6, characterized in that: The lower edge of the sector block is chamfered.

8. The circuit breaker tripping stroke adjustment fixture according to claim 1, characterized in that: The housing (1) is rectangular, and the stop block (5) is integrally formed with the housing (1).

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